I just find it stupid.
I can understand (even if not agree) with the cards being rotated out, but there's nothing to stop the board still being useable - it's not like they've copied the board's layout onto a newer one.
Also means that this time next year, when S4 drops, 5(!) boards will become obsolete* so anyone that's hasn't bought Beastgrave and/or S4 will be unable to play in tournaments, something that card rotation didn't stop (just made it so you were very handicapped).
* Obsolete in OP games, I know there's the new Relics format and club games.